<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .active{
            color: greenyellow;
            font-size: 72px;
        }
        .text-danger{
            font-family: '楷体';
        }
    </style>
</head>

<body>
    <div id="app">
        <span :class="[activeClass, errorClass]">
            {{天边}}
        </span>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.12"></script>
    <script>
        let app = new Vue({
            el: '#app',
            data() {
                return {
                    isLive: false,
                    classParam: {
                        haha: true,
                        heihei: false
                    },
                    天边: '怎么看不见',
                    activeClass: 'active',
                    errorClass: 'text-danger'
                }
            },
        })
    </script>
</body>

</html>